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k in (-oo:+oo)
-4*k-(4/7) = -144/7 // + -144/7
-4*k-(4/7)-(-144/7) = 0
144/7-4*k-4/7 = 0
20-4*k = 0 // - 20
-4*k = -20 // : -4
k = -20/(-4)
k = 5
k = 5
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